This is a discussion on Does the WRX have a limited slip differential? within the Transmission & AWD forums, part of the Tech & Modifying & General Repairs category; What is the differential setup on the WRX please? Limited slip in the rear? Thanks....

If it is a WRX and not an STi variant it has open front and middle diffs. It will have a limited slip rear if it is an earlier WRX, but not if it a later WRX.

WRX Info Links, Courtesy TheJMan is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis ZorbasI lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

WRX Info Links, Courtesy TheJMan is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis ZorbasI lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

Interesting. I would classify the viscous center coupling as "limited slip."

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I think you are right, because if it were anywhere else I'd not have considered it open. You're right.

WRX Info Links, Courtesy TheJMan is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis ZorbasI lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

Does the WRX have a limited slip differential?

I think those can be opened by pulling a fuse?

Last edited by Sinister; 09-11-2012 at 08:54 PM.

WRX Info Links, Courtesy TheJMan is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis ZorbasI lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

I'm confused here gents. To me, an "open" diff insinuates a simple pin and ring mechanism that distributes torque to either of two output shafts from a single input shaft. To add a limited slip mechanism to a differential suggests the addition of any device that disallows (or resists) a large torque bias between either output shaft (keeps torque evenly distributed). This can be accomplished with a viscous coupling, Torsen or any other torque sensing mechanical mechanism, clutch-type, Detroit locker, or any other exotic mechanism. Kevin you suggested the center diff on the 4EAT is a Torsen type. This is a mechanical locking mechanism that can evenly distribute torque in accordance to the torque bias ratio. If SD is indeed correct and the center LSD can be disabled with the pull of a fuse, I would suggest that the center LSD is a clutch type LSD similar to the DCCD. The planetary gearset is simply to achieve the uneven torque distribution under normal driving. FWIW the 5mt doesn't have a planetary gearset since the bias is 50/50 during normal operation.

I'm confused here gents. To me, an "open" diff insinuates a simple pin and ring mechanism that distributes torque to either of two output shafts from a single input shaft. To add a limited slip mechanism to a differential suggests the addition of any device that disallows (or resists) a large torque bias between either output shaft (keeps torque evenly distributed). This can be accomplished with a viscous coupling, Torsen or any other torque sensing mechanical mechanism, clutch-type, Detroit locker, or any other exotic mechanism. Kevin you suggested the center diff on the 4EAT is a Torsen type. This is a mechanical locking mechanism that can evenly distribute torque in accordance to the torque bias ratio. If SD is indeed correct and the center LSD can be disabled with the pull of a fuse, I would suggest that the center LSD is a clutch type LSD similar to the DCCD. The planetary gearset is simply to achieve the uneven torque distribution under normal driving. FWIW the 5mt doesn't have a planetary gearset since the bias is 50/50 during normal operation.

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I used to think I understood differentials. Clearly I need to go read some more articles.

I'm confused here gents. To me, an "open" diff insinuates a simple pin and ring mechanism that distributes torque to either of two output shafts from a single input shaft. To add a limited slip mechanism to a differential suggests the addition of any device that disallows (or resists) a large torque bias between either output shaft (keeps torque evenly distributed). This can be accomplished with a viscous coupling, Torsen or any other torque sensing mechanical mechanism, clutch-type, Detroit locker, or any other exotic mechanism. Kevin you suggested the center diff on the 4EAT is a Torsen type. This is a mechanical locking mechanism that can evenly distribute torque in accordance to the torque bias ratio. If SD is indeed correct and the center LSD can be disabled with the pull of a fuse, I would suggest that the center LSD is a clutch type LSD similar to the DCCD. The planetary gearset is simply to achieve the uneven torque distribution under normal driving. FWIW the 5mt doesn't have a planetary gearset since the bias is 50/50 during normal operation.

Sent from my DROID BIONIC using Tapatalk 2

I'll have to look into it again, but I believe the 4EAT uses a MPT (multi plate transfer) clutch as well as the planetary torsen center, and the vlsd in the rear. But I believe that the front is open. I cannot remember off the top of my noggin though

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